Multimode fibers(MMFs)are increasingly pursued for ultrathin and lensless endoscopic imaging,but their ex-treme susceptibility to bend-induced mode scrambling has so far impeded practical deployment.We uncover a hithe...Multimode fibers(MMFs)are increasingly pursued for ultrathin and lensless endoscopic imaging,but their ex-treme susceptibility to bend-induced mode scrambling has so far impeded practical deployment.We uncover a hitherto overlooked bend resilience in step-index multimode fibers and convert it into a proximal strategy for flexible imaging.Under fiber bending curvature the far-field image degrades from the center outward,yet a peripheral annulus conveyed by higher-order modes remains largely unperturbed across bend angles approaching 90°.Exploiting this"immunity belt,"we devise a three-stage reconstruction pipeline that isolates bend tolerant spatial frequencies in the Fourier domain,transplants them into the corrupted core via feature-guided Poisson fusion,and removes residual noise with physics informed dehazing.Systematic tests on 15 cm to 2 m fibers yield a mean matching score gain of 38%over 250 sequential bend states,restoring features in both 3D figurines and high-contrast test gratings.A dual-fiber probe integrated in a needle further resolves centimeter-scale anatomy in a gastric phantom and underscores the method's clinical relevance and feasibility for minimally in-vasive diagnostic applications.This work highlights the potential of computational reconstruction to significantly enhance the robustness and practical applicability of multimode fiber imaging in biomedical and industrial contexts.展开更多
基金Hangzhou Joint Fund of the Zhejiang Provincial Natural Science Foundation(LHZY24F030002)Open Fund of the State Key Laboratory of Precision Meauring Technology and Instruments(Tianjin University)(Pilab2401)Hangzhou Institute for Advanced Study,UCAS.
文摘Multimode fibers(MMFs)are increasingly pursued for ultrathin and lensless endoscopic imaging,but their ex-treme susceptibility to bend-induced mode scrambling has so far impeded practical deployment.We uncover a hitherto overlooked bend resilience in step-index multimode fibers and convert it into a proximal strategy for flexible imaging.Under fiber bending curvature the far-field image degrades from the center outward,yet a peripheral annulus conveyed by higher-order modes remains largely unperturbed across bend angles approaching 90°.Exploiting this"immunity belt,"we devise a three-stage reconstruction pipeline that isolates bend tolerant spatial frequencies in the Fourier domain,transplants them into the corrupted core via feature-guided Poisson fusion,and removes residual noise with physics informed dehazing.Systematic tests on 15 cm to 2 m fibers yield a mean matching score gain of 38%over 250 sequential bend states,restoring features in both 3D figurines and high-contrast test gratings.A dual-fiber probe integrated in a needle further resolves centimeter-scale anatomy in a gastric phantom and underscores the method's clinical relevance and feasibility for minimally in-vasive diagnostic applications.This work highlights the potential of computational reconstruction to significantly enhance the robustness and practical applicability of multimode fiber imaging in biomedical and industrial contexts.
